A while ago, before I switched to SpamBayes, I had used Firetrust's Mailwasher. It effectively stopeed spam based on filters and even bounced e-mails back so the spammers thought that my address didn't exist. However, the bounced mails became less effective as spammers spoofed e-mail addresses and the filters were subverted by the spammer's tactics. So I have tried everything else and settled on SpamBayes. However, SpamBayes has been putting a lot of stress on my hard drive as it has to analyze thousands of e-mails a day to see if they're spam and then process them in Outlook. I was becoming worried about my drive, so I decided to give Mailwasher Pro 4.0 another go.
The software has improved greatly since the last time I used it. The filters are much more robust and the blacklisting feature works well. But, aside from those basic options, you can subscribe to Firetrust's real-time spam database and they have been extremely accurate (I watched it for a day or so and then just let it automatically delete). Since every e-mail is checked by a human before being classified as spam (and only after two users have reported it), there is little chance of a newsletter or other legitimate spam being blocked. All this for just $7/year - a price well worth paying (I registered Mailwasher way back when and they still support updates).
On top of the real-time database, I also have Mailwasher set up to query Spamcop to determine if the mail is being sent from a blacklisted domain, and if it is, it is also automatically deleted on the server level (just like Firetrust's database queries), so the e-mails are never on my computer. They are never analyzed by SpamBayes, they are never a problem. So now I've got the Firetrust Real-Time Spam Database, the Spamcop database and my own filters which I am tweaking (only been using this new version a couple of days), and I'm able to get down to a manageable level of mails to sort through (and report to Firetrust) manually.
The reason I went back to Mailwasher from SpamBayes, like I said above, is because of all the e-mails I was getting on a daily basis. The last time I reported my stats was on
March 22nd, and every 2 days I received 4,500 e-mails. At the time, that was manageable for SpamBayes and didn't put too much strain on my hard drive. But now, checking my stats in Mailwasher Pro, today I received 14,061 e-mails. Of those, 37 were from people on my "friends" list (I added any e-mail that I want to receive to my friends list). So basically, out of about 14,000 e-mails, about 40 were good. Thank god for the internet. Maybe it really is time to switch over to my GMail account permanently.
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FIRETRUST : Products : MailWasher� Pro Overview